<template>
  <div class="drag" ref="dragDiv">
    <div class="drag_bg"></div>
    <div class="drag_text">{{confirmWords}}</div>
    <div ref="moveDiv" @mousedown="mousedownFn($event)" :class="{'handler_ok_bg':confirmSuccess}"
      class="handler handler_bg" style="position: absolute;top: 0px;left: 0px;"></div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      beginClientX: 0 /*距离屏幕左端距离*/,
      mouseMoveStata: false /*触发拖动状态  判断*/,
      maxwidth: "" /*拖动最大宽度，依据滑块宽度算出来的*/,
      confirmWords: "请按住滑块，拖动到右边" /*滑块文字*/,
      confirmSuccess: false /*验证成功判断*/
    };
  },
  mounted() {
    this.maxwidth =
      this.$refs.dragDiv.clientWidth - this.$refs.moveDiv.clientWidth;
    document
      .getElementsByTagName("html")[0]
      .addEventListener("mousemove", this.mouseMoveFn);
    document
      .getElementsByTagName("html")[0]
      .addEventListener("mouseup", this.moseUpFn);
  },
  methods: {
    mousedownFn: function(e) {
      if (!this.confirmSuccess) {
        e.preventDefault && e.preventDefault(); //阻止文字选中等 浏览器默认事件
        this.mouseMoveStata = true;
        this.beginClientX = e.clientX;
      }
    }, //mousedoen 事件
    successFunction() {
      this.confirmSuccess = true;
      this.confirmWords = "验证通过";
      if (window.addEventListener) {
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mousemove", this.mouseMoveFn);
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mouseup", this.moseUpFn);
      } else {
        document
          .getElementsByTagName("html")[0]
          .removeEventListener("mouseup", () => {});
      }
      document.getElementsByClassName("drag_text")[0].style.color =
        "rgba(0,0,0,0.4)";
      document.getElementsByClassName("handler")[0].style.left =
        this.maxwidth + "px";
      document.getElementsByClassName("drag_bg")[0].style.width =
        this.maxwidth + "px";
        this.$emit("sliderStatus",this.confirmSuccess)
    }, //验证成功函数
    mouseMoveFn(e) {
      if (this.mouseMoveStata) {
        let width = e.clientX - this.beginClientX;
        if (width > 0 && width <= this.maxwidth) {
          document.getElementsByClassName("handler")[0].style.left =
            width + "px";
          document.getElementsByClassName("drag_bg")[0].style.width =
            width + "px";
        } else if (width > this.maxwidth) {
          this.successFunction();
        }
      }
    }, //mousemove事件
    moseUpFn(e) {
      this.mouseMoveStata = false;
      var width = e.clientX - this.beginClientX;
      if (width < this.maxwidth) {
        document.getElementsByClassName("handler")[0].style.left = 0 + "px";
        document.getElementsByClassName("drag_bg")[0].style.width = 0 + "px";
      }
    } //mouseup事件
  }
};
</script>

<style scoped>
.drag {
  position: relative;
  background-color: #edf6ff;
  width: 100%;
  height: 48px;
  line-height: 48px;
  text-align: center;
  color: rgba(0, 0, 0, 0.4);
  font-size: 14px;
  border-radius: 10px;
}
.handler {
  width: 64px;
  height: 48px;
  /* border: 1px solid #ccc; */
  cursor: move;
}
.handler_bg {
  background: #edf6ff url("../assets/img/arrow.png") no-repeat center;
  background-size: contain;
  border-radius: 10px 0 0 10px;
}
.handler_ok_bg {
  background: #edf6ff url("../assets/img/access.png") no-repeat center;
  background-size: contain;
  border-radius: 0 10px 10px 0;
}
.drag_bg {
  background-color: #edf6ff;
  height: 48px;
  width: 0px;
  border-radius: 10px;
}
.drag_text {
  position: absolute;
  top: 0px;
  width: 100%;
  text-align: center;
  -moz-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
  border-radius: 10px;
}
</style>
